On the Existence, Rareness, and Uniqueness of Quenched H i-rich Galaxies in the Local Universe
Using data from ALFALFA, xGASS, H i -MaNGA, and the Sloan Digital Sky Survey (SDSS), we identify a sample of 47 “red but H i -rich” (RR) galaxies with near-UV (NUV) − r > 5 and unusually high H i -to-stellar mass ratios. We compare the optical properties and local environments between the RR gala...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2024-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/ad1ce3 |
| _version_ | 1797289347385393152 |
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| author | Xiao Li Cheng Li H. J. Mo Jianhong Hu Jing Wang Ting Xiao |
| author_facet | Xiao Li Cheng Li H. J. Mo Jianhong Hu Jing Wang Ting Xiao |
| author_sort | Xiao Li |
| collection | DOAJ |
| description | Using data from ALFALFA, xGASS, H i -MaNGA, and the Sloan Digital Sky Survey (SDSS), we identify a sample of 47 “red but H i -rich” (RR) galaxies with near-UV (NUV) − r > 5 and unusually high H i -to-stellar mass ratios. We compare the optical properties and local environments between the RR galaxies and a control sample of “red and H i -normal” (RN) galaxies that are matched in stellar mass and color. The two samples are similar in the optical properties typical of massive red (quenched) galaxies in the local Universe. The RR sample tends to be associated with slightly lower-density environments and has lower clustering amplitudes and smaller neighbor counts at scales from several hundred kiloparsecs to a few megaparsecs. The results are consistent with the RR galaxies being preferentially located at the center of low-mass halos, with a median halo mass ∼10 ^12 h ^−1 M _⊙ compared to ∼10 ^12.5 h ^−1 M _⊙ for the RN sample. This result is confirmed by the SDSS group catalog, which reveals a central fraction of 89% for the RR sample, compared to ∼60% for the RN sample. If assumed to follow the H i size–mass relation of normal galaxies, the RR galaxies have an average H i -to-optical radius ratio of R _HI / R _90 ∼ 4, four times the average ratio for the RN sample. We compare our RR sample with similar samples in previous studies, and quantify the population of RR galaxies using the SDSS complete sample. We conclude that the RR galaxies form a unique but rare population, accounting for only a small fraction of the massive quiescent galaxy population. We discuss the formation scenarios of the RR galaxies. |
| first_indexed | 2024-03-07T19:03:40Z |
| format | Article |
| id | doaj.art-b5f6a42e48414b3eb0de4669df4be1cf |
| institution | Directory Open Access Journal |
| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-03-07T19:03:40Z |
| publishDate | 2024-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj.art-b5f6a42e48414b3eb0de4669df4be1cf2024-03-01T10:49:07ZengIOP PublishingThe Astrophysical Journal1538-43572024-01-0196328610.3847/1538-4357/ad1ce3On the Existence, Rareness, and Uniqueness of Quenched H i-rich Galaxies in the Local UniverseXiao Li0https://orcid.org/0000-0002-2884-9781Cheng Li1https://orcid.org/0000-0002-8711-8970H. J. Mo2https://orcid.org/0000-0001-5356-2419Jianhong Hu3Jing Wang4https://orcid.org/0000-0002-6593-8820Ting Xiao5https://orcid.org/0000-0003-1938-8669Department of Astronomy, Tsinghua University , Beijing 100084, People's Republic of China ; xli27938@gmail.com, cli2015@tsinghua.edu.cnDepartment of Astronomy, Tsinghua University , Beijing 100084, People's Republic of China ; xli27938@gmail.com, cli2015@tsinghua.edu.cnDepartment of Astronomy, University of Massachusetts Amherst , MA 01003, USADepartment of Astronomy, Tsinghua University , Beijing 100084, People's Republic of China ; xli27938@gmail.com, cli2015@tsinghua.edu.cnKavli Institute for Astronomy and Astrophysics, Peking University , Beijing 100871, People's Republic of ChinaSchool of Physics, Zhejiang University , Hangzhou, Zhejiang 310058, People's Republic of ChinaUsing data from ALFALFA, xGASS, H i -MaNGA, and the Sloan Digital Sky Survey (SDSS), we identify a sample of 47 “red but H i -rich” (RR) galaxies with near-UV (NUV) − r > 5 and unusually high H i -to-stellar mass ratios. We compare the optical properties and local environments between the RR galaxies and a control sample of “red and H i -normal” (RN) galaxies that are matched in stellar mass and color. The two samples are similar in the optical properties typical of massive red (quenched) galaxies in the local Universe. The RR sample tends to be associated with slightly lower-density environments and has lower clustering amplitudes and smaller neighbor counts at scales from several hundred kiloparsecs to a few megaparsecs. The results are consistent with the RR galaxies being preferentially located at the center of low-mass halos, with a median halo mass ∼10 ^12 h ^−1 M _⊙ compared to ∼10 ^12.5 h ^−1 M _⊙ for the RN sample. This result is confirmed by the SDSS group catalog, which reveals a central fraction of 89% for the RR sample, compared to ∼60% for the RN sample. If assumed to follow the H i size–mass relation of normal galaxies, the RR galaxies have an average H i -to-optical radius ratio of R _HI / R _90 ∼ 4, four times the average ratio for the RN sample. We compare our RR sample with similar samples in previous studies, and quantify the population of RR galaxies using the SDSS complete sample. We conclude that the RR galaxies form a unique but rare population, accounting for only a small fraction of the massive quiescent galaxy population. We discuss the formation scenarios of the RR galaxies.https://doi.org/10.3847/1538-4357/ad1ce3Galaxy dark matter halosInterstellar atomic gasCold neutral mediumNeutral hydrogen cloudsCold dark matterInterstellar clouds |
| spellingShingle | Xiao Li Cheng Li H. J. Mo Jianhong Hu Jing Wang Ting Xiao On the Existence, Rareness, and Uniqueness of Quenched H i-rich Galaxies in the Local Universe The Astrophysical Journal Galaxy dark matter halos Interstellar atomic gas Cold neutral medium Neutral hydrogen clouds Cold dark matter Interstellar clouds |
| title | On the Existence, Rareness, and Uniqueness of Quenched H i-rich Galaxies in the Local Universe |
| title_full | On the Existence, Rareness, and Uniqueness of Quenched H i-rich Galaxies in the Local Universe |
| title_fullStr | On the Existence, Rareness, and Uniqueness of Quenched H i-rich Galaxies in the Local Universe |
| title_full_unstemmed | On the Existence, Rareness, and Uniqueness of Quenched H i-rich Galaxies in the Local Universe |
| title_short | On the Existence, Rareness, and Uniqueness of Quenched H i-rich Galaxies in the Local Universe |
| title_sort | on the existence rareness and uniqueness of quenched h i rich galaxies in the local universe |
| topic | Galaxy dark matter halos Interstellar atomic gas Cold neutral medium Neutral hydrogen clouds Cold dark matter Interstellar clouds |
| url | https://doi.org/10.3847/1538-4357/ad1ce3 |
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